已知:如图,在△ABC中,AD是BC边上的高,∠B=30°,∠ACB=45°,CE是AB边上的中线.
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333036273893376/2333122729279489/STEM/1fcf16b1c9724ea1a684156ca78bb942.png?resizew=231)
(1)若AD=1,请计算BC的长;
(2)求证CD=
AB;
(3)若CG=EG,求证:DG⊥CE.
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333036273893376/2333122729279489/STEM/1fcf16b1c9724ea1a684156ca78bb942.png?resizew=231)
(1)若AD=1,请计算BC的长;
(2)求证CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)若CG=EG,求证:DG⊥CE.
18-19八年级·浙江·阶段练习 查看更多[1]
(已下线)【新东方】【义乌2】初二
更新时间:2019-11-13 18:13:15
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解答题-证明题
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适中
(0.65)
【推荐1】如图1,在等腰三角形
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,
、
在斜边上,且
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绕点
按顺时针方向旋转
得
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①试说明
的理由;
②求证:
;
(2)如图3,若原题中点
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在
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①试说明
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②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea1f54541438740d1cb0e5b14caa0cf.png)
(2)如图3,若原题中点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知
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与
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求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
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解答题-证明题
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适中
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【推荐1】如图,四边形ABCD中,AC平分∠DAB,AC2=AB•AD,∠ADC=90°,E为AB的中点.
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(1)求证:△ADC∽△ACB;
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解答题-问答题
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适中
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